Backscatter interrogators, communication systems and backscatter communication methods
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides backscatter interrogators, communication systems and backscatter communication methods. According to one aspect of the present invention, a backscatter interrogator includes a data path configured to communicate a data signal; a signal generator configured to generate a carrier signal; and a modulator coupled with the data path and the signal generator, the modulator being configured to spread the data signal to define a spread data signal and amplitude modulate the carrier signal using the spread data signal, the modulator being further configured to phase modulate the carrier signal.
-
Citations
54 Claims
-
1-47. -47. (canceled)
-
48. An interrogator comprising:
-
a code generator for generating a first pseudo-noise sequence;
a code generator for generating a second pseudo-noise sequence;
first logic circuitry for encoding the first pseudo-noise sequence with a data signal to create a spread data signal;
second logic circuitry for randomly inverting the spread data signal using the second pseudo-noise sequence; and
a summing amplifier for outputting a tri-state signal using the second pseudo-noise signal and a randomly inverted spread data signal. - View Dependent Claims (49, 50, 51, 52, 53, 54)
-
Specification